linux-kernel - [PATCH v1 08/11] x86/mm/pat: remove strict_prot parameter from reserve_pfn

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Message-ID: <20250425081715.1341199-9-david@redhat.com>
Date: Fri, 25 Apr 2025 10:17:12 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	x86@...nel.org,
	intel-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-trace-kernel@...r.kernel.org,
	David Hildenbrand <david@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Jann Horn <jannh@...gle.com>,
	Pedro Falcato <pfalcato@...e.de>,
	Peter Xu <peterx@...hat.com>
Subject: [PATCH v1 08/11] x86/mm/pat: remove strict_prot parameter from reserve_pfn_range()

Always set to 0, so let's remove it.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 arch/x86/mm/pat/memtype.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c
index 668ebf0065157..57e3ced4c28cb 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -858,8 +858,7 @@ int memtype_kernel_map_sync(u64 base, unsigned long size,
  * Reserved non RAM regions only and after successful memtype_reserve,
  * this func also keeps identity mapping (if any) in sync with this new prot.
  */
-static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
-				int strict_prot)
+static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot)
 {
 	int is_ram = 0;
 	int ret;
@@ -895,8 +894,7 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
 		return ret;
 
 	if (pcm != want_pcm) {
-		if (strict_prot ||
-		    !is_new_memtype_allowed(paddr, size, want_pcm, pcm)) {
+		if (!is_new_memtype_allowed(paddr, size, want_pcm, pcm)) {
 			memtype_free(paddr, paddr + size);
 			pr_err("x86/PAT: %s:%d map pfn expected mapping type %s for [mem %#010Lx-%#010Lx], got %s\n",
 			       current->comm, current->pid,
@@ -906,10 +904,6 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
 			       cattr_name(pcm));
 			return -EINVAL;
 		}
-		/*
-		 * We allow returning different type than the one requested in
-		 * non strict case.
-		 */
 		pgprot_set_cachemode(vma_prot, pcm);
 	}
 
@@ -959,7 +953,7 @@ int pfnmap_track(unsigned long pfn, unsigned long size, pgprot_t *prot)
 {
 	const resource_size_t paddr = (resource_size_t)pfn << PAGE_SHIFT;
 
-	return reserve_pfn_range(paddr, size, prot, 0);
+	return reserve_pfn_range(paddr, size, prot);
 }
 
 void pfnmap_untrack(unsigned long pfn, unsigned long size)
-- 
2.49.0